| Citation: |
ZHU Zaibin, LING Hui, YANG Xiaoping, et al. Study on compressive strength and thermal conductivity of interlayer reinforced and stiffened CFRP composites with CNT films[J]. Acta Materiae Compositae Sinica, 2024, 41(3): 1235-1248. DOI: 10.13801/j.cnki.fhclxb.20230814.005
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In recent years, carbon fiber reinforced resin matrix composites with integrated structure and function have received extensive attention. The poor longitudinal compression strength and in-plane thermal conductivity also become the main factors restricting its application. In this paper, the active role of carbon nanotube films in the fabrication of structure-function integrated composites is explored by using interlayer reinforced stiffening technique.
Firstly, the S-CNTF, E-CNTF and S-E-CNTF are prepared by wet stretching and epoxidation reaction based on P-CNTF, and used for interlayer reinforcing and stiffening CFRP composites (CFRP/S-CNTF, CFRP/E-CNTF and CFRP/S-E-CNTF), respectively. The physicochemical properties and tensile properties of carbon nanotube films are analyzed by SEM, Raman polarization, FTIR, XPS and DMA. The compression failure mechanism and thermal conductivity mechanism of the composite are analyzed by in-plane shear test, interlayer shear test, longitudinal compression test, SEM cross section analysis, thermal infrared imaging technology and laser flash method.
(1) Compared with P-CNTF, on the one hand, the degree of alignment of S-CNTF and S-E-CNTF is obviously increased, and the CNTs are rearranged and presented directional arrangement with large bundling state, on the other hand, the surface of E-CNTF and S-E-CNTF is confirmatively grafted with epoxy group. The optimized physicochemical structure results in enhancement of tensile strength and modulus of S-CNTF, E-CNTF and S-E-CNTF, and the tensile strength of S-CNTF, E-CNTF and S-E-CNTF is increased from 26.8 MPa to 81.2 MPa, 64.3 MPa and 116.0 MPa, respectively, and the tensile modulus of S-CNTF, E-CNTF and S-E-CNTF is increased from 0.3 GPa to 3.1 GPa, 1.1 GPa and 6.3 GPa, respectively. (2) Compared with CFRP composites, the in-plane shear modulus of CFRP/P-CNTF, CFRP/S-CNTF, CFRP/E-CNTF and CFRP/S-E-CNTF is enhanced by 8.6%, 21.2%, 13.8% and 28.3%, respectively, and the interlaminar shear strength of CFRP/P-CNTF, CFRP/S-CNTF, CFRP/E-CNTF and CFRP/S-E-CNTF is enhanced by 5.3%, 7.4%, 22.1% and 34.2%, respectively. The model prediction also shows that, compared to CFRP composites, the theoretically elastic compressive stress of CFRP/P-CNTF, CFRP/S-CNTF, CFRP/E-CNTF and CFRP/S-E-CNTF is increased from 857 MPa to 907 MPa, 1012 MPa, 978 MPa and 1120 MPa，respectively, and plastic of the longitudinal compressive strength is increased from 207 MPa to 237 MPa, 241 MPa, 256 MPa and 274 MPa, respectively, which is in accord with experimental values. The longitudinal compressive strength of CFRP/P-CNTF, CFRP/S-CNTF, CFRP/E-CNTF and CFRP/S-E-CNTF by experimental test is enhanced by 5.5%, 16.4%, 21.7% and 35.2%, respectively. Moreover, the in-plane thermal conductivity of CFRP/P-CNTF, CFRP/S-CNTF, CFRP/E-CNTF and CFRP/S-E-CNTF is improved from 4.32 W/(m·K) to 5.70 W/(m·K), 6.43 W/(m·K), 6.11 W/(m·K) and 7.8 W/(m·K), respectively.Conclusions: The structure-function integrated carbon fiber composites have been successfully fabricated by interlayer reinforcement and stiffening technology based on carbon nanotube films. The ability of the composites to resist shear deformation and interlayer crack growth is strengthened, which further inhibits the failure of the kinked band and delamination failure during the compression process of the composites. Meanwhile, the carbon nanotube film constructs a three-dimensional thermal conductivity network structure through the interlayer region in the composites, improves the heat transfer efficiency, and achieves the simultaneous enhancement of longitudinal compression strength and in-plane thermal conductivity.
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